Would somebody care to explain to me what this "f/8 AF limitation" is, please?

Does it mean autofocus won't work if you set your aperture smaller than f/8?

No, it just means that if your lens largest aperture is smaller than f/5.6 (next step is f/8 typically) it can't autofocus. Focusing is always made at largest aperture, the lens is stopped down to the target aperture when taking the picture.

Lenses don't have as small as f/8 natively, but with teleconverters you get it, 1.4x adds one stop, 2x two. So if your camera cannot do f/8 autofocus you cannot get autofocus with a 2x teleconverter on an f/4 lens or 1.4x on an f/5.6 lens, which can be a limitation for especially wildlife photography. 2x on 500/4 to get 1000/8 with autofocus can be a nice option to have. Or on the low end 400/5.6 => 560/8.

Excellent explanation. Thank you! I know understand and see what the problem could be. My f/2.8 lens would not have an issue, but an f/5.6 lens with a 2x teleconverter would. Not being able to use AF at that point would rather suck.Thanks, understood and filed.

Not sure this qualifies as a 'landscape' per se, but I think it turned out well enough to show here. Everyone is invited to post images with snow in them. Let's make this the photochallenge for the week.

Hdew are great, prices are unbeatable £1425 for a 5d2, £655 for a 24-105. Hong kong imports with duty paid, but you can visit them at their Surrey office and pick up in person before you have paid.

I highly recommend them.

They offered me this option as well, which was the dealmaker for me. I could've had a friend of mine that lives nearby picking the lens up. I just had him swing by and check the place out. Then I decided it was ok to part with my money. I will shop there again, I have worked up quite the shopping list.